I tried commenting primFlush: fileID in StandardFileStream>>#flush on my desktop PC and the "store" benchmark's speed improved significantly.
Original result on Windows 7: 11 per sec Result without flushing on Windows 7: 9 430 per sec Original result on Linux Mint 17: 26 590 per sec Result without flushing on Linux Mint 17: 34 879 per sec Mentioned Linux Mint is in VirtualBox on the same PC. Also loading of Roassal2 now takes 58 seconds insted of 386. Jan Nicolai Hess wrote > 2015-07-01 7:46 GMT+02:00 Jan Blizničenko < > bliznjan@.cvut > >: > >> Sounds good, could I try it and run all those benchmarks etc. on it on my >> PCs? >> >> Jan >> > > With this: > http://stackoverflow.com/questions/14290337/is-fwrite-faster-than-writefile-in-windows > It seems this all comes down to calling FlushFileBuffers. > > You can check what would happen if we just disabling the explicit flushing > (comment out > self primFlush: fileID > in StandardFileStream>>#flush) > and run the benchmarks. > > > (Of course, I don't know what side effects this have, *I* think WriteFile > calls flush on > its own, and of course *if* this solves the problem, we can not just > disable call to flush in the > image, but have to change the windows file plugin). > > > > > > >> >> >> Nicolai Hess wrote >> > Yes, the vm primitives, like I already told some messages above. >> > FilePrimitives ARE slow on windows. >> > >> > We may get better performance, if we disable windows file >> cache/buffering >> > and use slightly different ways to do the CreateFile and WriteFile >> > calls, and do the buffering on our own, but this is not easy. >> > >> > Luckily (?), this may be alread work if we use the std file api (?) >> > >> > A small dirty test: >> > >> > store bench >> > latest vm -> '22.098 per second' >> > modified vm -> '31,027 per second' >> > >> > (in the modified vm I replaced all file operation from >> > sqWin32FilePrims.c >> > with the code from >> > sqFilePluginBasicPrims.c) >> > >> > The result may seem strange, because both implementation will actually >> use >> > win32s CreateFile/WriteFile methods, but >> > maybe the second one uses better caching/buffering. >> > >> > nicolai >> >> >> >> >> >> -- >> View this message in context: >> http://forum.world.st/Slow-compilation-on-one-of-my-Windows-PCs-tp4834668p4835032.html >> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >> >> -- View this message in context: http://forum.world.st/Slow-compilation-on-one-of-my-Windows-PCs-tp4834668p4835044.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.
